standards-sdk-py 0.1.10

Python SDK for Hedera standards and Registry Broker parity with TypeScript and Go SDKs.

HOL HCS SDK (Python)

	Python reference implementation of the Hiero Consensus Specifications (HCS) and Registry Broker utilities with parity against the TypeScript and Go SDKs. 📚 Standards SDK Documentation 📖 Hiero Consensus Specifications Documentation

Quick Start

cd standards-sdk-py
python -m venv .venv
source .venv/bin/activate
pip install -e ".[dev]"
pytest -q

Install

pip install standards-sdk-py

conda install -c hashgraph-online standards-sdk-py

Multi-Language SDK Links

Canonical SDK docs URL: https://hol.org/docs/libraries/standards-sdk/

Language	Package	Source	Canonical Documentation
TypeScript	@hol-org/standards-sdk	hashgraph-online/standards-sdk	https://hol.org/docs/libraries/standards-sdk/
Go	github.com/hashgraph-online/standards-sdk-go	hashgraph-online/standards-sdk-go	https://hol.org/docs/libraries/go-sdk/overview
Python	standards-sdk-py	hashgraph-online/standards-sdk-py	https://hol.org/docs/libraries/python-sdk/overview

Developer Tooling

cd standards-sdk-py
.venv/bin/pre-commit install
.venv/bin/pre-commit run --all-files

Documentation

For standards and API documentation:

• Standards SDK Documentation
• HCS Standards Documentation
• Libraries.io Package Page
• piwheels Package Page

Citation and Archival

• Citation metadata: CITATION.cff
• Zenodo metadata: .zenodo.json
• Software Heritage origin: https://archive.softwareheritage.org/browse/origin/?origin_url=https://github.com/hashgraph-online/standards-sdk-py

Supported Packages

Package	Coverage
standards_sdk_py.hcs2	HCS-2 registry topic creation, indexed entry operations, memo helpers, mirror reads.
standards_sdk_py.hcs3	HCS-3 recursive file loading helpers.
standards_sdk_py.hcs5	HCS-5 hashinal inscription and minting helpers.
standards_sdk_py.hcs6	HCS-6 non-indexed registry creation, registration helpers, memo helpers.
standards_sdk_py.hcs7	HCS-7 indexed registry and metadata registration helpers.
standards_sdk_py.hcs10	HCS-10 topic/message builders and communication helpers.
standards_sdk_py.hcs11	HCS-11 profile models/builders, validation, inscription helpers.
standards_sdk_py.hcs12	HCS-12 action/assembly/hashlinks helpers.
standards_sdk_py.hcs14	HCS-14 UAID parsing and resolution helpers.
standards_sdk_py.hcs15	HCS-15 account creation and memo helpers.
standards_sdk_py.hcs16	HCS-16 flora account/topic/message helpers.
standards_sdk_py.hcs17	HCS-17 state-hash helpers.
standards_sdk_py.hcs18	HCS-18 discovery topic/message helpers.
standards_sdk_py.hcs20	HCS-20 points message and validation helpers.
standards_sdk_py.hcs21	HCS-21 adapter declaration helpers.
standards_sdk_py.hcs26	HCS-26 memo parser/resolver helpers.
standards_sdk_py.hcs27	HCS-27 checkpoint helpers.
standards_sdk_py.inscriber	Inscriber auth, quote, submit, and polling workflows.
standards_sdk_py.registry_broker	Full Registry Broker client (search, adapters, registries, credits, verification, chat/encryption, skills, ledger auth).
standards_sdk_py.mirror	Mirror node client used by standards and inscriber modules.
standards_sdk_py.shared	transport, config, network/operator helpers, and shared typing.

CodeSandbox Examples

• Examples index
• standards-sdk-discovery
• hcs2-create-registry
• hcs5-build-mint
• hcs6-create-registry
• hcs7-register-metadata
• hcs10-build-message
• hcs11-build-agent-profile
• hcs12-build-register
• hcs14-parse-uaid
• hcs15-build-account-tx
• hcs16-build-flora-topic-tx
• hcs17-build-state-message
• hcs18-build-announce
• hcs20-deploy-points
• hcs21-build-declaration
• hcs26-parse-memos
• hcs27-publish-checkpoint
• inscriber-auth-client
• mirror-topic-messages
• registry-broker-skill-domain-proof
• registry-broker-uaid-dns-verification

Environment Variables

Common:

• HEDERA_NETWORK
• HEDERA_ACCOUNT_ID or HEDERA_OPERATOR_ID
• HEDERA_PRIVATE_KEY or HEDERA_OPERATOR_KEY

Network-scoped overrides:

• TESTNET_HEDERA_ACCOUNT_ID
• TESTNET_HEDERA_PRIVATE_KEY
• MAINNET_HEDERA_ACCOUNT_ID
• MAINNET_HEDERA_PRIVATE_KEY

Registry Broker:

• REGISTRY_BROKER_BASE_URL
• REGISTRY_BROKER_API_KEY
• REGISTRY_BROKER_LEDGER_API_KEY

Inscriber integration:

• RUN_INTEGRATION=1
• RUN_INSCRIBER_INTEGRATION=1

Tests

Unit and contract tests:

cd standards-sdk-py
.venv/bin/pytest -q

Parity checks:

cd standards-sdk-py
.venv/bin/standards-sdk-py-generate-inventory --repo-root ..
.venv/bin/standards-sdk-py-check-parity

Live testnet inscriber end-to-end:

cd standards-sdk-py
cp ../standards-sdk/.env ./.env
pip install hedera-sdk-py
set -a
source <(grep -E '^[A-Za-z_][A-Za-z0-9_]*=' ./.env)
set +a
export RUN_INTEGRATION=1
export RUN_INSCRIBER_INTEGRATION=1
.venv/bin/pytest -m integration -k inscriber_registry_broker_end_to_end_testnet -vv -rs

Live testnet HCS-2 end-to-end:

cd standards-sdk-py
export RUN_INTEGRATION=1
export RUN_HCS2_INTEGRATION=1
export HEDERA_NETWORK=testnet
export TESTNET_HEDERA_ACCOUNT_ID="<your-testnet-account-id>"
export TESTNET_HEDERA_PRIVATE_KEY="<your-testnet-private-key>"
.venv/bin/pytest -m integration -k hcs2_end_to_end_testnet -vv -rs

Notes:

• Set HEDERA_NETWORK=testnet (and do not set a conflicting INSCRIBER_HEDERA_NETWORK).
• The test uses ledger challenge auth from your testnet credentials to avoid accidentally using a mainnet-scoped API key.

CI/CD and Security

• Python matrix CI (3.11, 3.12, 3.13) for ruff, black, mypy, unit tests, parity checks, and package validation.
• Security workflows for dependency review, pip-audit, Bandit SARIF upload, CodeQL, and verified TruffleHog secret scanning.
• Release workflow for build + twine check, TestPyPI/PyPI trusted publishing, checksum artifacts, provenance attestations, and GitHub release notes.
• Conda workflow for building packages and uploading to anaconda.org/hashgraph-online when ANACONDA_API_TOKEN is configured.
• Release indexing automation verifies PyPI + Libraries.io pages and submits a Software Heritage save request.

Contributing

Open issues or pull requests in the repository:

• https://github.com/hashgraph-online/standards-sdk-py/issues

Security

For disclosure and response policy, see SECURITY.md.

Maintainers

Maintained by HOL.

Resources

• Hiero Consensus Specifications (HCS) Documentation
• Hedera Documentation
• Telegram Community

📝 Blog Tutorials

• Building a Decentralized Registry with Go & HCS-2
• HCS-14: Profiles and Agent AID Resolution
• ERC-8004: Trustless Agent Registry
• Universal Agent Discovery with MCP

License

MIT